IFA positive for C. burnetii antibodies (n = 169) | IFA negative for C. burnetii antibodies (n = 687) | Measures of association | ||
---|---|---|---|---|
Crude | Adjusted | |||
Spontaneous abortion < 22 weeks (n = 8) | 2 (1.2%) | 6 (0.9%) | OR: 1.4 | 1.5 (95% CI: 0.3–7.6)* |
Preterm birth (< week 37) (n = 41) | 3 (1.8%) | 38 (5.5%) | OR: 0.3 | OR: 0.4 (95% CI: 0.1–1.1)** |
Gestational age (>week 36 + 6) (n = 806****) Median gestational age (interquartile range) | 40 weeks 3 days (39 w, 3d; 41 w,1 d) | 40 w, 2 days (39w, 3d; 41w,1d) | Mean difference in days*** 0.91 days | 1.2 days (−0.4– +2.7)** |